package com.mark.util;

import lombok.extern.slf4j.Slf4j;

import java.security.MessageDigest;

/**
 * Created by Choisaaaa on 2018/4/23.
 * 密码MD5加密
 */

@Slf4j
public class MD5Util {

    private static String byteArrayToHexString(byte b[]) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++)
            resultSb.append(byteToHexString(b[i]));

        return resultSb.toString();
    }

    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    //返回大写MD5
    private static String MD5Encode(String origin, String charsetname) {
        String resultString = null;
        try {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (charsetname == null || "".equals(charsetname))
                resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
            else
                resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
        } catch (Exception exception) {
            log.error("MD5 MD5Encode Exception:{}",exception);
        }
        return resultString.toUpperCase();
    }

    public static String MD5EncodeUtf8(String origin) {
        try {
            origin = origin + PropertiesUtil.getProperty("password.salt", "");
            return MD5Encode(origin, "utf-8");
        } catch (Exception e) {
            log.error("MD5 MD5EncodeUtf8:{}",e);
           throw  new RuntimeException(e);
        }
    }

    private static final String hexDigits[] = {"0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"
    };

    public static void main(String[] args) {
        System.out.print(MD5Util.MD5EncodeUtf8("123456"));
    }

}
